Jacketed vacuum flask



June 24, 1952 E VENlS 2,601,573

JACKETED VACUUM FLASK Filed OCT.. 28, 1949 FIG.|. FIG.2.

Patented `lune 24, 1952 .L'ThefBi-itisn Vacuum Flask Company, "Limited, London, England, a British company @applicationfo'ctoberzs, 1949,s

eriarNotiaaMs .InGreat Britain Novem-benl; 1948 This `inventicm relatesto .vacuum yjacketed ves- 'sels and in concerned Vmore particularly -with vacuum yj acketed askssuch as .are generally--em- `ployed :for conserving .heated beverages, liquids and the like. l v v y In accordance with the invention a vacuum jacketedy flask lincludes Van gouter .casing for 'body which -is-gadapted vto house-a-sil-vered flaskor the vlike and is so constructedas 'to allow of the l.application --and attachment .to 'opposite end portions thereof of two cups or like containers adapted yon removalfromsaid casing or body to serve as drinking vessels.

In order thatthe said invention `may be clearly understood .and readily carried into effect the same will be hereinafter more fullydescribed with reference tothe accompanying drawings in which:

Figure l shows'a vacuum flask according to the invention partly in elevation kand partly in 'section; t

' :Figure .2 .is a view similar` 'to 'that shown Figure l1 Vbutlwith the cups fcrfcontainers removed.

Referring now to the drawing I denotes 'ia normal silveredflask whichis -disposed within a cylindrical or other suitably shaped casing or `body I-I `the latter being formed with a reduced 'portion-or neck I2 into which the neck of the fiask is adapted to rit. The neck of the flask is centered and maintained in position with respect to the neck of the casing or body II by means of a ring I3 of rubber or other suitable material which is adapted to engage the same and is seated in an annular recess formed internally of the neck of said casing or body. In order to prevent relative rotation between the flask III and the casing or body I I it may be desirable to roughen or otherwise suitably treat the wall of the recess in which the rubber ring I3 is seated in order to provide a grip for said ring and to prevent any possible rotational movement thereof. The roughening may, for example. be effected by forming a screw thread on the wall of the recess.

As is general with flasks of this character the outer surface of the casing or body is formed or provided with an external screw threaded portion Il at or adjacent its upper end such threaded portion providing securing means for a cup or like container I5 which is adapted to be applied over the upper end of the complete flask and when in position to form an additional closure therefor.

That end of the casing or body Ill remote from the reduced portion or neck I2 and hereinafter termed the lower end, is adapted to be closed by virtue of the application thereto of a cup shaped closure element I6 which is preferably formed of metal. The closure element I6, which may be vthreaded vorothe'rwise releasably secured in Lposition at the lower end of Ythe casing or body, .is preferably formed with a base of dished or other suitable formation .adapted to im-part thereto a degree of resilience. Additionally, the base Ais formed, as lfor example vby pressing, with an inwardly directed. boss or collar .I.'I adapted to providea seating fora ring I8 of resilient or eX-ible material such asrubber, the arrangementbeing such .that whenl theiiask Il 'is in position within thelou'ter casing or body I.I and the closure e'lement I6 is applied thereto -the flower .end of said flask will seat or bear on the ring k-I'i which constitutes a resilient lcushion or buffer., vInorder further to support vthe 4rlask'IIl relatively .to the casing or body `I I an additional ring '|19 o'f rubber or other .suitable .material is provided which tis adapted to encircle 'the body of the flask such additional ring being rclamped in, position lon ap- .plication of the closureelement Iiil to saidcas'ing The closure element 'is formed externally .with a screWth-readed portion l2ll which is adapted to .provide securing means for a second vcup or `like container 2l which, is yadaptedto be applied Ito the .base of .the iiask -ove'r said vvclosure element. The flask according to the invention thus 'includes two drinking cups or containers I5 and 2I which are adapted, when not in use, to be applied to opposite ends thereof.

Instead of securing the cups and the closure element in position on the casing or body by virtue of the provision of Screw threads on the respective parts it may be desirable to adopt any other readily releasable j ointing or securing means such as, for example, bayonet type joints or the like.

Preferably, the general construction is such that when in position on the opposite ends of the casing or body the cups will form a continuation of the surface of such casing or body and will impart thereto a streamlined or substantially streamlined form.

With a vacuum jacketed flask according to the invention insertion and removal of the flask into and from the casing or body is facilitated since, on removal of the closure element I6 the flask may be directly inserted into or removed from the lower end of said casing or body.

While it is proposed to construct the casing or body II and the cups or containers I5 and 2| of plastic or similiar material such parts may well be made of metal or other suitable material.

I claim:

1. A vacuum jacketed flask comprising an outer casing formed at one end with a portion of reduced diameter and having threads at the end portion thereof remote from said portion of reduced diameterfa cup-shaped closure element'l formed with a stepped side wall deiining an an'- nular seat facing axially toward the open end of said closure element, the edge portion of said side wall being formed with threads for removably attaching said closure element to said threaded end portion of the outer casing, a silvered flask disposed within said casing, resilient suspension means for cushioning said fiask within said outer casing, said suspension means including a iirst resilient packing ring carried by said portion of reduced diameter for engagement around the neck of the flask, a resilient buffer element interposed between the base of said flask and the bottom of said closure element and a second resilient packing ring disposed between said remote end of said casing/and said annular seat of the closure element to be axially compressed by the latter when it ig threaded onto said casing so that said second resilient packing then presses radially upon the flask intermediate the ends of the latter, and two cup-like drinking vessels detachably mounted on said portion of reduced diameter and on said lclosure element.

to'prevent rotation of said rst resilient packing ring relative to said outer casing.

3. A vacuum jacketed flask comprising an outer casing formed at one end with a portion of reduced diameter having threads at the base thereof, the end portion of said casing remote from said portion of reduced diameter being formed with threads thereon, a cup-shaped closure ele'- ment formed with a stepped side wall widening toward the open end thereof and defining an annular seat facing axially toward said open end, said stepped side wall being formed with threads in the portions of greater and lesser diameter thereof at opposite sides of said seat, the threads.

in said portion of'greater diameter being engageable with the threads on said remote end portion of the outer casing for removably attaching said closure element to said outer casing. a silvered flask disposed in said outer casing, a rst resilient packing ring carried byY said portion of reduced diameter for engagement with the neck of said flask, a resilient buffer element interposed between the base end of said flask and the bottom of said closure element, a second resilientpacking ring disposed between the end edge of said outer casing remote from said portion of reduced diameter and said annular seat of the closure ele-I ment to be axially compressed by the latter when said closure elementis threaded onto said casing so that said second packing ring fthen presses radially upon said flask intermediate the ends of the latter, a first cup-like drinking vessel having a threaded mouth portion for engagement with said threads at the base of said portion of reduced diameter, and asecond cup-like drinking vessel having a threaded mouth portion for engagement with the threads of said portion of lesser diameter of said closure element side wall so that said first and second cup'like drinking vessels may be carried at the opposite ends of said outer casing and when so carried are substantially flush with the outer surface of the latter.

4. A vacuum jacketed flask as set forth in claim 3; wherein said bottom wall of the closure element is dished upwardly to impart a degree of resiliency thereto'.

ERNEST VENTS'.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

